Lab+5_Histology Worksheet

Lab+5_Histology Worksheet - GI Histology Worksheet The GI...

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GI Histology Worksheet The GI system consists of the GI tract and its associated glands (salivary glands, liver, gall bladder, pancreas). The GI tract includes the oral cavity, pharynx, esophagus, stomach, small intestine (duodenum, jejunum, ileum), large intestine (cecum, colon, rectum, anal canal). The GI tract (or tube) consists of 4 layers; there are slight variations between the different segments of the tract however, the four layers are generally the same. 1. Mucosa Epithelial layer (usually simple columnar) Lamina propria (loose CT w/ blood vessels, lymphatics, and sometime glands) Muscularis mucosae (thin layer of smooth muscle separating mucosa from submucosa 2. Submucosa Dense CT w/ lots of blood and lymph vessels, a nerve plexus (Meissner’s nerve plexus), lymphoid tissue, and glands 3. Muscularis externa Made of 2 layers of smooth muscle (inner circular and outer longitudinal) Another nerve plexus lies between the two layers (myenteric or Auerbach’s nerve plexus) 4. Serosa A thin layer of loose connective tissue, rich in blood and lymph vessels and adipose tissue, and a simple squamous covering epithelium ( mesothelium ). In the abdominal cavity, the serosa is continuous with the mesenteries (thin membranes covered by mesothelium on both sides), which support the intestines, and with the peritoneum, a serous membrane that lines the cavity wall. Muscularis externa
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Oral cavity The oral cavity is lined with stratified squamous epithelium. At the lips, the epithelium becomes keratinized. Tongue
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Lab+5_Histology Worksheet - GI Histology Worksheet The GI...

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